Median prices of condos in core Boston neighborhoods rose 8.51 percent to $949,500 in the third quarter, driven by limited supply and continuing strong demand.

Statewide condo sales volume rose 5.6 percent from the previous year to 1,970 in September according to a report published this morning by The Warren Group, publisher of Banker & Tradesman. And median sales prices shot up 14.3 percent year-over-year to $375,000. Sales volume year-to-date has declined 2.3 percent.

Median condo prices hit $967,500 in Boston’s core neighborhoods for the month of September, up from $830,000 the prior year, according to Warren Group data.

East Boston and Charlestown also have seen big condo price gains over the past year. The median sales price in Charlestown hit $844,000 in September, up from $665,000 in September 2018. And median condo prices in East Boston were $617,000 in September, compared with $549,250 in September 2018.

A separate report issued yesderday by Douglas Elliman Real Estate showed the median condo price in Boston’s core neighborhoods including Charlestown hit $866,500. Median prices have risen on a year-over-year basis for seven of the last eight quarters.

The price per square foot increased 14 percent to $1,134, the steepest increase in 19 years. But sales declined 12.5 percent to 846, and listing inventory expanded for the sixth consecutive quarter.

“Even with inventory continuing to expand, buyers are encountering limited supply which is causing sales to decline. This is one of the tightest sales market in the country,” Scott Elwell, a senior executive regional manager for Douglas Elliman, said in a statement.

The report analyzed condo sales in Back Bay, Beacon Hill, Charlestown, Fenway, Midtown, North End, Seaport, South Boston, South End and West End.